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EPA On-line Tools for Site Assessment Calculation

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Henry's law coefficients can be expressed in at least four sets of units. Two of these are nominally dimensionless, but because they represent either ratios of concentrations or ratios of mass fractions their values differ greatly.

Henry's Law Conversions

Input Henry's Law Constant Hcc Hyx or Hpx Hpc
Temperature ^°C

Output Hcc Hyx or Hpx Hpc

Units for Henry's Law Constant Conversions

H_cc = Concentration/Concentration (dimensionless)
H_yx = Mole Fraction Y / Mole Fraction X (dimensionless)
H_px = Partial Pressure / Mole Fraction X (atmospheres)
H_pc = Parial Pressure / Concentration (atm m³/mol)

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